JP3984968B2 - Electronic communication equipment - Google Patents

Description

  The present invention relates to an electronic communication device such as a mobile phone, a personal digital assistant (PDA), and a notebook personal computer.

  2. Description of the Related Art Conventionally, portable electronic communication devices such as mobile phones, PDAs, and notebook personal computers have been downsized. Along with this, the structure of electronic communication devices has a structure in which various electronic components are arranged in a space-efficient manner. It has been demanded.

  9 and 10 are a perspective view of a mobile phone as an example of a conventional electronic communication device and an internal structure thereof (particularly, a structure around a speaker 109). In this mobile phone, a display portion 104a of the liquid crystal display 104 is provided on a part of the outer casing 100 (upper part in use) so as to be visible through a transparent portion of the outer casing 100, and in the vicinity thereof for receiving a call. A speaker (receiver) 114 is provided, a dial operation unit 115 having a plurality of (12 in the illustrated example) dial keys 102 is provided at a position outside the display unit 104a, and a transmission microphone 116 is provided in the vicinity thereof. ing.

  As shown in FIG. 10, in the dial operation unit 115 of this cellular phone, a hole for projecting the dial key 102 is formed on the front side of the outer casing 100, and the dial key 102 is connected to the inner side of the outer casing 100. The key sheet 105 is arranged. Conductive rubber (not shown) is provided on the back surface of the dial key 102 of the key sheet 105, and a keyboard substrate 106 that is electrically connected to the conductive rubber is disposed on the frame 108 inside the outer casing 100 and is hooked 108a. It is fixed by. A liquid crystal display 104 is provided on the keyboard substrate 106. A speaker 109 is fixed to the exterior housing 100. The speaker 109 is disposed so as to be in close contact with the inner surface of the outer casing 100 on the back side of the mobile phone, that is, the side opposite to the user operating the dial key 102. A circuit board 111 that is electrically connected to the spring terminal 110 of the speaker 109 is disposed inside the speaker 109. Note that a telephone call is performed using the receiver 114 and the microphone 116, while ringing tone notification, game sound effects, and pronunciation of moving image sounds are performed using the speaker 109. In general, the speaker 109 is desired to produce higher sound quality and higher sound volume than the receiver 114, and a relatively large speaker 109 is often used.

  In this conventional example, a large number of dial keys 102 and a liquid crystal display 104 are arranged on the front side of the outer casing 100 (the side on which the user operates the dial key 2). If the speaker 109 is also arranged on the front side, it is necessary to increase the size of the entire mobile phone. For example, it is necessary to secure an arrangement space for the speaker 109 by increasing the overall length of the outer casing 100. However, in the present situation where downsizing is strongly demanded for the convenience of carrying mobile phones, the speaker 109 cannot be arranged on the front side of the outer casing 100, and is arranged on the back side of the outer casing 100. Is adopted.

In the electronic communication terminal such as a recent mobile phone, it not only to pronounce Shin roar you notify the incoming call, etc., to play high-quality sound of the music that has been downloaded from the game pronounce the sound effects or download site There is. In such a case, it is desirable to make the user listen as high as possible in sound quality. However, as described above, in the conventional mobile phone, the speaker 109 is arranged on the back side of the exterior casing 100, and the sound generated from the speaker 109 is transmitted to the user facing the front side of the exterior casing 1. Cannot be heard with high sound quality. In particular, high directivity high frequency sound is not transmitted to the front side (liquid crystal display surface side) of the exterior casing, and the acoustic effect is greatly reduced.

  In order to deliver high-quality sound by delivering a high-frequency sound with sharp directivity, it is desirable that the speaker 109 of the mobile phone is provided on the front side of the outer casing 100 located in front of the user. In order to increase the mounting density and reduce the size with emphasis on the convenience of carrying, there are two conflicting demands that the speaker 109 is desirably disposed on the back side of the outer casing 100 of the mobile phone. Similar problems may occur in electronic communication devices such as PDAs and notebook personal computers other than mobile phones.

Therefore, in Patent Documents 1 and 2, a duct is connected to a sound emitting hole (port) provided from the speaker to the front side of the exterior casing, in which the speaker is disposed on the back side of the exterior casing. The provided arrangement is disclosed. Patent Document 3 discloses a configuration in which a sound emitting hole is provided on the side surface side of the exterior housing. Patent Documents 4 to 6 disclose speakers suitable for use in these configurations.
JP 2003-119773 A JP 2001-197182 A JP 2001-189981 A JP 2000-244433 A JP 2003-111194 A JP 2003-244787 A

  According to the configuration described in Patent Documents 1 to 3 and the like, sound quality and volume can be obtained by sounding from a sound emitting hole on the front side or side of the exterior casing through a duct from a speaker provided on the back side of the exterior casing. Can be improved. However, in these configurations, a dedicated duct (a tip portion is a sound emitting hole) is provided in the speaker. For example, as shown in Patent Documents 4 to 6, a configuration in which a speaker with a duct attached in advance is attached in the exterior housing is conceivable. However, in these configurations, the mounting position of the various components on the front side can be secured by setting the mounting position of the speaker to the back side of the exterior housing, but the components are not provided to provide a duct that did not exist conventionally. In addition, since it is necessary to dispose the duct after processing such as forming a mounting portion for arranging the duct on the keyboard substrate or the frame, the manufacturing process becomes complicated.

  Accordingly, an object of the present invention is to arrange a speaker itself on the back side of the outer casing and prevent high-quality sound for a user facing the front side of the outer casing without hindering the downsizing of the entire electronic communication device. It is an object of the present invention to provide an electronic communication device that can be heard and does not increase the number of parts and complicate the manufacturing process.

The electronic communication device of the present invention is integrally formed with a speaker disposed on the back side inside the exterior casing, a frame for supporting a substrate disposed on the front side inside the exterior casing, and the frame. And has a hollow cylindrical duct whose one end is close to the sound emitting hole provided on the front side of the outer casing and whose other end is close to the sound emitting surface of the speaker . According to this configuration, it is possible to reduce the size of the electronic communication device by widening the mounting area on the front side of the outer casing, and to allow the user on the front side of the outer casing to hear high-quality sound. In addition, since the duct is integrally formed with the frame, there is no increase in parts or complication of the manufacturing process. Furthermore, since the key sheet and the dial key are arranged on the substrate and constitutes the operation part on the front side of the outer casing, the space on the front side of the outer casing must be widened. Is very effective.

  A large volume front air chamber that is continuous with the other end of the duct is formed integrally with the frame. In addition, the vibration of the air emitted by the speaker can be transmitted more efficiently without complicating the manufacturing process.

The substrate preferably has a hole through which the duct passes and is disposed in close contact with the frame. Further, it is preferable that the eye of the hook is provided which to affix a substrate to the frame. With these configurations, the configuration inside the exterior housing becomes more compact and easy to assemble.

A plurality of sound emission holes are provided on the front side of the exterior housing, the number of speakers is the same as the number of sound emission holes, and the number of ducts is the same as the number of sound emission holes and speakers. Good.

  A pair of exterior casings are connected so as to be openable and closable, and one of the exterior casings has a recess that extends from the front side to the side surface covered with the other exterior casing in a state where the pair of exterior casings are closed. The sound emission hole may be configured to be provided in the recess. In this case, even when the exterior housing is closed, the sound emitted from the sound emission hole is transmitted from the depression to the side and easily reaches the user with high sound quality.

  According to the present invention, the speaker is arranged on the back surface side of the outer casing, and the sound generated from the speaker is generated while ensuring a large mounting area for the parts on the front surface where the dial key, the liquid crystal display, etc. are arranged. It can be delivered to the user on the front side of the exterior casing with sufficient sound quality and volume, and the number of parts is not increased and the manufacturing process is not complicated. Moreover, it does not hinder downsizing of electronic communication equipment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
1 to 3 show a mobile phone which is a first embodiment of the electronic communication device of the present invention. In this cellular phone as well, as in the conventional example shown in FIGS. 8 and 9, the display unit 4a of the liquid crystal display 4 is provided in a part of the outer casing 1 (upper part in the use state) so as to be visible. A speaker (receiver) 14, a dial operation unit 15 having a plurality of (12 in the illustrated example) dial keys 2, and a microphone 16 for transmission are provided. In addition, a sound emission hole (port) 18 connected to a speaker 9 and a duct 7 to be described later is opened on the front side of the exterior housing 1.

  As shown in FIGS. 2 and 3, in the dial operation unit 15, a hole for projecting the dial key 2 is formed on the front side of the outer casing 1, and the dial key 2 is connected to the inner side of the outer casing 1. The key sheet 5 is disposed, a conductive rubber (not shown) is provided on the back surface of the dial key 2 of the key sheet 5, and the contact contact 17 that conducts with the conductive rubber is etched as a copper foil pattern. A substrate 6 is disposed on the frame 8 inside the exterior housing 1. A liquid crystal display 4 is provided on the keyboard substrate 6. A speaker 9 is fixed to the exterior housing 1. The speaker 9 is disposed in the vicinity of the inner surface of the exterior housing 1 on the back surface side of the mobile phone, that is, on the surface opposite to the side where the user operates the dial key 2. A circuit board 11 that is electrically connected to the spring terminal 10 of the speaker 9 is disposed between the speaker 9 and the surface of the exterior housing 1. The telephone call is performed using the receiver 14 and the microphone 16, but the ring tone notification, the sound effect of the game, the pronunciation of the moving image sound, and the like are performed using the speaker 9. In FIG. 3, the receiver 14 and microphone 16 are not shown for simplicity.

  The frame 8 is provided with holes 8a for avoiding components mounted on the keyboard substrate 6, hooks 8b and 8c for fixing to the keyboard substrate 6 are provided on both sides, and a duct connected to the speaker 9. 7 and the front air chamber 3 are integrally formed. The front air chamber 3 is shown by a dotted line in FIG. The keyboard substrate 6 is provided with a hole 6 a for allowing the duct 7 to penetrate and closely contact the sound emitting hole 18 on the front side of the exterior housing 1. The keyboard substrate 6 and the frame 8 are fixed in close contact with hooks 8b and 8c. The frame 8 serves to increase the strength so that the keyboard substrate 6 is not deformed by the pressure when the dial key 2 is pressed down. When the dial key 2 is depressed, the contact contact 17 of the keyboard substrate 6 is electrically connected to the conductive rubber on the back surface of the depressed dial key 2 to perform a predetermined process.

  Because of the configuration as described above, in the completed state of the mobile phone of the present embodiment, one end of the duct 7 is close to the front sound emitting hole 18 of the exterior housing 1 and the other end is the large volume front air chamber 3. Is close to the sound emitting surface 9c of the speaker 9. That is, the speaker 9 disposed on the back surface side of the exterior housing 1 is connected to the front air chamber 3 and the duct 7 integrally formed with the frame 8, and the duct 7 penetrates the hole 6 a of the keyboard substrate 6 and the exterior housing. The sound emission hole 18 on the front side of the body 1 is reached. Therefore, the sound emitted from the speaker 9 is emitted from the sound emitting hole 18 to the outside through the front air chamber 3 and the duct 7.

  Specifically, although not shown, an electrical output (signal current) is output from the acoustic circuit portion of the circuit board 11 on which circuit components for wireless communication and control are mounted to the speaker 9 via the spring terminal 10. Supplied. This signal current causes the speaker 9 to generate an acoustic output and transmit air vibration to the front air chamber 3 formed integrally with the frame 8. Since the speaker 9 and the front air chamber 3 are in close contact with each other, this air vibration is all transmitted from the front air chamber 3 to the duct 7 that is also integrally formed with the frame 8. The front end of the duct 7 is brought into close contact with the inner surface of the outer casing 1 so that air leakage does not occur. Therefore, the air vibration of the duct 7 is radiated to the outside of the housing from the sound emitting hole 18 opened in the exterior housing 1.

  In the present embodiment, the frame 8 is provided with the front air chamber 3 and the duct 7 that are in close contact with the speaker 9, so that the speaker 9 is disposed on the back side (back side) of the key sheet 5, the keyboard substrate 6, and the frame 8. Even so, sufficient sound quality and volume can be delivered to the user on the dial operation unit 15 side (front side) of the exterior housing 1. By disposing the speaker 9 on the back surface side of the exterior housing 1, a large mounting area for each member on the front side can be secured, and the key sheet 5 and the liquid crystal display 4 are disposed close to each other to reduce the size. Can be achieved.

  Furthermore, in this embodiment, the duct 7 and the front air chamber 3 are integrally formed on the frame 8 conventionally used to increase the strength of the keyboard substrate 6 so as not to be deformed when the dial key 2 is pressed down. Because there are no extra parts. Further, as long as the frame 8 is arranged at a predetermined position, the duct 7 is not required to be positioned or attached, so that the manufacturing process can be prevented from becoming complicated. In particular, when the frame 8 is formed by injection molding of a synthetic resin, the duct 7 can be integrally formed very easily, and the manufacturing process is not complicated.

  A schematic diagram of the duct 7 and the front air chamber 3 is shown in FIG. 4A, and the acoustic characteristics of the duct 7 are shown in FIG. 4B. The duct 7 has resonance characteristics as acoustic characteristics, and the resonance frequency varies depending on the length of the duct 7. Here, the resonance characteristics when the length of the duct 7 is 0 mm, 2.5 mm, 5 mm, and 7.5 mm are shown. If the frequency is about 5 kHz or less, resonance does not occur in the band, and the speaker characteristics of this embodiment are substantially flat.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is provided about the part similar to 1st Embodiment, and description is abbreviate | omitted.

  In the present embodiment, the duct 7 and the front air chamber 3 are integrally formed at a position away from the center of the frame 8 in the width direction. In the illustrated example, the duct 7 is formed obliquely in order to connect to the sound emitting hole 18 provided at the center in the width direction of the exterior housing 1. Thus, the position and shape of the duct 7 can be changed according to the mounting of various components in the exterior housing 1. Of course, the positions of the sound emission hole 18 and the speaker 9 may be moved in accordance with the position of the duct 7. The positions of the sound emitting hole 18, the speaker 9, and the duct 7 can be arbitrarily set, and the shape of the duct 7 is preferably determined so as to transmit vibration without air leakage according to the respective positions. Since other configurations are the same as those in the first embodiment, description thereof is omitted.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG. In addition, about the part similar to 1st, 2 embodiment, the same code | symbol is provided and description is abbreviate | omitted.

  In the present embodiment, a plurality (for example) of two speakers 9a and 9b are provided, and the frame 8 is provided with two ducts 7a and 7b and two front air chambers 3a and 3b. Although not shown, the exterior housing 1 is provided with two sound emission holes. And from each speaker 9a, 9b, it connects with two sound emission holes through the front air chambers 3a, 3b and the ducts 7a, 7b, respectively. In this way, the number of speakers can be increased arbitrarily, and the number of front air chambers and ducts can be increased accordingly. Since other configurations are the same as those in the first embodiment, description thereof is omitted.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG. In addition, about the part similar to 1st-3rd embodiment, the same code | symbol is provided and description is abbreviate | omitted.

  In the present embodiment, a receiver 14 as a receiving speaker is disposed on the back side of the frame 8 and is connected to another sound emitting hole 18 c via another duct 7 c formed integrally with the frame 8. The duct 7 c extends through another hole 6 b provided in the keyboard substrate 6. According to this configuration, since not only the speaker 9 but also a relatively small receiver 14 is arranged on the back side of the exterior casing 1, the mounting area on the front side of the exterior casing 1 can be further increased, Further downsizing of the outer casing 1 can also be achieved. And since the added duct 7c is integrally formed in the flame | frame 8 similarly to the duct 7, a manufacturing process is not complicated. Since other configurations are the same as those in the first embodiment, description thereof is omitted.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIG. In addition, about the part similar to 1st-4th embodiment, the same code | symbol is provided and description is abbreviate | omitted.

  The mobile phone of this embodiment has a folded structure. That is, a pair of exterior casings 1a and 1b are joined to each other by a hinge mechanism (not shown) so as to be opened and closed. The liquid crystal display 4 and the receiver 14 are provided in one (upper side in use) outer casing 1a, and the dial operation unit 15 and the microphone are provided in the other (lower side in use) outer casing 1b. 16 and sound emitting holes 18a and 18b are provided. In the present embodiment, although not shown in FIG. 8, a pair of speakers 9a and 9b, a pair of front air chambers 3a and 3b, and a pair of ducts 7a and 7b, as in the third embodiment. Are built in and connected to the sound emitting holes 18a and 18b, respectively. Further, the sound emitting holes 18a and 18b are formed in groove-shaped depressions 19a and 19b formed so as to extend from the surface to the side surface of the exterior casing 1b.

  Also in this embodiment, when the exterior casings 1a and 1b are opened, the same effects as those in the above-described embodiments are obtained. When the exterior casings 1a and 1b are closed and folded, the display unit 4a overlaps so as to cover the sound emitting holes 18a and 18b, but the air vibration radiated from the sound emitting holes 18a and 18b, that is, the speaker. The sounds generated from 9a and 9b are radiated to the outside through the depressions 19a and 19b, respectively. Therefore, even in the folded state, the sound generated from the speakers 9a and 9b reaches the user with sufficient sound quality and volume. Since other configurations are the same as those in the first embodiment, description thereof is omitted.

  In addition, it can also be set as the structure which combined each above-mentioned embodiment arbitrarily. The present invention is also applicable to electronic communication devices other than mobile phones, such as PDAs and personal computers.

1 is a perspective view showing a mobile phone according to a first embodiment of the present invention. It is sectional drawing of the mobile telephone shown in FIG. It is a disassembled perspective view which shows the keyboard substrate of the mobile telephone shown in FIG. 1, a flame | frame, and a speaker. (A) is a schematic diagram of a duct and a front air chamber, (b) is a graph which shows the acoustic characteristic of the duct. It is a perspective view which shows the flame | frame of the 2nd Embodiment of this invention. It is a disassembled perspective view which shows the flame | frame and speaker of the 3rd Embodiment of this invention. It is sectional drawing which shows the mobile telephone of the 4th Embodiment of this invention. It is a perspective view which shows the mobile telephone of the 5th Embodiment of this invention. It is a perspective view which shows the conventional mobile phone. FIG. 10 is a cross-sectional view of the mobile phone shown in FIG. 9.

Explanation of symbols

1, 1a, 1b Exterior casing 2 Dial keys 3, 3a, 3b Front air chamber 4 Liquid crystal display 4a Display unit 5 Key sheet 6 Keyboard substrate 6a, 6b Hole 7, 7a, 7b, 7c Duct 8 Frame 8a Hole 8b, 8c Hook 9, 9a, 9b Speaker 9c Sound emitting surface 10 Spring terminal 11 Circuit board 14 Speaker for reception (receiver)
15 Dial operation part 16 Microphone for transmission 17 Contact contact 18, 18a, 18b Sound emission hole 19a, 19b Recessed part

Claims (7)

A speaker arranged on the back side inside the exterior housing;
A frame for supporting a substrate disposed on the front side of the exterior housing;
A hollow cylindrical duct integrally formed with the frame, having one end close to a sound emitting hole provided on the front side of the exterior housing and the other end close to a sound emitting surface of the speaker ; Have
An electronic communication device in which a key sheet and a dial key are disposed on the substrate, and constitutes an operation unit on the front side of the exterior casing .   The frame is integrally formed with a large volume front air chamber that is continuous with the other end of the duct, and the other end of the duct is close to the sound emitting surface of the speaker via the front air chamber. The electronic communication device according to claim 1.   The electronic communication device according to claim 1, wherein the substrate has a hole through which the duct passes and is disposed in close contact with the frame.   The electronic communication device according to claim 1, wherein the frame is provided with a hook for fixing the substrate. A plurality of the sound emission holes are provided on the front side of the exterior housing, the speakers are provided in the same number as the sound emission holes, and the ducts are provided in the same number as the sound emission holes and the speakers. The electronic communication apparatus of any one of Claims 1-4 . A pair of the exterior casings are connected so as to be openable and closable, and one side of the exterior casing is connected to the other side of the pair of exterior casings from the front side to the side surface side. recess extends is provided with the sound output hole is provided in the recess, the electronic communications device according to any one of claims 1-5. Electronic communication device according to any one of claims 1 to 6 which is a mobile phone.

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